Imagine it's winter, and you're standing on a frozen lake or pond, when suddenly below your feet you notice hundreds of turtles. What are they doing down there below the ice?
. However, some species do not fare as well without oxygen and can only survive a few weeks at a time if submerged without adequate oxygen. These species need to extract the oxygen dissolved in the water to survive.
The northern map turtle is an example of such a species. They have also been observed engaging in locomotor activity—they keep moving around under the ice during the winter.Northern map turtles were observed over a century ago byDuring a dive at a communal hibernation site in November 1991 in Vermont, marine biologists observed
map turtles walking across the bottom of a river before ice coverage when temperatures were dropping to near 0°CThese observations lead us to believe that this behavior may be important to a map turtle's ability to survive the winter.
A northern map turtle swims underwater with a tri-axial accelerometer attached to its back. Credit: Grégory Bulté, CC BYa value called overall dynamic body accelerationCombining this information with measurements of depth and temperature, we were able to paint a detailed picture of each turtle's behavior without ever seeing them.Our findings surprised us. The data showed that northern map turtles move, albeit locally, every day of the winter.
Although we expected some level of activity based on previous observations, we did not expect the turtles to be so fidgety all winter long.
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